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So I did a test where I was comparing efficiency between HashMap, TreeMap, LinkedHashMap and HashTable. For every structure I was using the same action: put 2000 elements in each array, sorted it and ...
如果HashMap的键(key)是自定义的对象，那么需要按规则定义它的equals()和hashCode()方法。 class Dog { String color; Dog(String c) { color = c ...
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